Display screen, or portion thereof, having a calendar graphical user interface with mail element



FIG. 1 is a front view of a display screen, or portion thereof, having a calendar graphical user interface with mail element;

FIG. 2 is an enlarged view of the segment of the callout region of FIG. 1 designated by callout region 2;

FIG. 3 is a front view of a display screen, or portion thereof, having a calendar graphical user interface with mail element shown in a second embodiment; and,

FIG. 4 is an enlarged view of the segment of the callout region of FIG. 3 designated by callout region 4.

The broken lines illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen, or portion thereof, having a calendar graphical user interface with mail element, as shown and described. 